| Rice production technology field trial had been conducted in Kamphaengphet province as a part of rice production potential zoning in the lower northern part. The objective is to increase rice production of farmers in this province. Rice varieties were planted with 156.25 kg/ha seed rate of direct seeding and chemical fertilizer were applied as recommended rate compared with soil analysis rate at appropiate times. The results found that soil analysis application can increase rice yield around 2 - 45 and 15 - 38% in both high and moderate suitable soil in 2011 and 2012, respectively depending on the rice variety, rice growing season and the farmers practices. Moreover, there are also some factors that contribute to yield loss such as climate and rainfall... |
